Third-grade mathematics began to be exposed to additions and subtractions within 10,000, the amount of calculation became significantly larger, and the vertical writing requirements were higher. This 100-question special exercise helps children to practice the large number addition and subtraction method firmly, and the answers are attached for parents to check.
Addition and subtraction within 10,000 is the key unit in the third grade book, and it is also the basis for multi-digit multiplication and division in the fourth grade. Children’s errors are often concentrated in: carry plus error, abdication minus error, digital misalignment, and results forgot to write. This exercise is aimed at these four questions.
Practice Schedule
- 100 three-digit and three-digit addition and subtraction methods, with uniform difficulty and sufficient questions;
- Suitable for practicing one page a day (about 20 questions) and completing one round in two weeks;
- Attach all the answers, and parents can make corrections accordingly.
Vertical calculation specification
- The same digits should be aligned, individual digits to individual digits, ten digits to ten digits;
- Counting from the individual digits, full ten into one, remember to write the leading one a little smaller;
- When abdicating, it is important to point up the abdication point to prevent forgetting;
- Finish the calculation and check again: whether the estimation results are close.
Ways to Improve Calculation Accuracy
There are no shortcuts to computing power, but there are ways to: ① Read the problem before writing to avoid copying the wrong number; ② Check the calculation immediately after calculation (subtraction check by addition, subtraction check by addition); ③ Practice at a fixed time every day to form a habit; ④ Organize the wrong problem into a book and redo it regularly.
After practicing this 100 questions, the child’s addition and subtraction method within 10,000 will basically pass the test.
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